XRMediaBinding: createEquirectLayer() method

The createEquirectLayer() method of the XRMediaBinding interface returns an XREquirectLayer object which is a layer that maps an equirectangular coded data onto the inside of a sphere.

Syntax

createEquirectLayer(video, options)

Parameters

video

An HTMLVideoElement to display.

options

An object to configure the XREquirectLayer. The object can have the following properties and space is required:

centralHorizontalAngle Optional

A number indicating the central horizontal angle in radians for the sphere. Default value: 6.28318 (2π).

invertStereo Optional

A boolean specifying if the natural location of each view in the video should be inverted. By default false.

layout Optional

A string indicating the layout of the video. Possible values:

default

The layer accommodates all views of the session.

mono

A single XRSubImage is allocated and presented to both eyes.

stereo

The user agent decides how it allocates the XRSubImage (one or two) and the layout (top/bottom or left/right). It is recommended to use the texture-array texture type for stereo layouts.

stereo-left-right

A single XRSubImage is allocated. Left eye gets the left area of the texture, right eye the right. This layout is designed to minimize draw calls for content that is already in stereo (for example stereo videos or images).

stereo-top-bottom

A single XRSubImage is allocated. Left eye gets the top area of the texture, right eye the bottom. This layout is designed to minimize draw calls for content that is already in stereo (for example stereo videos or images). The default value is mono.

lowerVerticalAngle Optional

A number indicating the lower vertical angle in radians for the sphere. Default value: -1.570795 (-π/2).

radius Optional

A number indicating the radius of the sphere. Default value 0.0.

space Required

An XRSpace object defining the layer's spatial relationship with the user's physical environment.

transform Optional

An XRRigidTransform object defining the offset and orientation relative to space.

upperVerticalAngle Optional

A number indicating the upper vertical angle in radians for the sphere. Default value: 1.570795 (π/2).

Return value

An XREquirectLayer object.

Examples

Creating an XREquirectLayer to display a video

Create an XRMediaBinding and use an HTMLVideoElement that is passed into createEquirectLayer(). Configure the quad layer using the options listed above and present the layer to the XR device by adding it to the layers render state in XRSession.updateRenderState().

function onXRSessionStarted(xrSession) {
  const xrMediaBinding = new XRMediaBinding(xrSession);
  const video = document.createElement("video");
  video.src = "just-fascination.mp4";

  const videoLayer = xrMediaBinding.createEquirectLayer(video, {
    space: xrReferenceSpace,
  });

  xrSession.updateRenderState({
    layers: [videoLayer],
  });
}

Specifications

Browser compatibility

See also

• XREquirectLayer